[pt] Os motores elétricos no Brasil são responsáveis pelo consumo de cerca de 25 porcento de toda a energia elétrica no país e, em sua grande parte, estão presentes na indústria. Estes equipamentos são fabricados para uso em bombas hidráulicas, compressores de ar, elevadores etc., podendo ser comercializados se atenderem aos índices de eficiência mínimos definidos pela Portaria INMETRO/MDIC N488 de 2010, garantindo o seu perfeito funcionamento e o consumo energético adequado. Contudo, alguns estabelecimentos estão comercializando produtos usados recondicionados, não atendendo à regulamentação desta Portaria, além de reformarem motores sem condições de uso. O objetivo desta dissertação é dimensionar e caracterizar o mercado de revenda e manutenção de motores elétricos de indução recondicionados no Brasil, estimando a perda de energia decorrente do recondicionamento incorreto. A metodologia do trabalho pode ser dividida em cinco etapas: estudo do estado da arte de recondicionamento de motores; quantificação de empresas e funcionários por meio de consultas às bases de dados governamentais; pesquisa de campo em amostras de empresas que fazem recondicionamento; extrapolação do estudo conduzido nas amostras para a população de empresas pesquisadas durante a pesquisa de campo; comparação dos resultados com estudos anteriores e dimensionamento das perdas elétricas do Brasil. Como resultado foi caracterizado e dimensionado o mercado de motores recondicionados, contendo: 6.503 empresas; 24,4 mil funcionários; 45 porcento das empresas realizando revenda de recondicionados; 6,9 milhões de motores recondicionados por ano, totalizando 7,46 porcento de perda, equivalentes a 2,9 Terawatt-hora. Além disso, dos 20 milhões de motores existentes no Brasil em 2016 há uma perda de 8,4 Terawatt-hora por uso de motores recondicionados e um grande aumento da venda de motores importados de baixa qualidade. Foram, assim, atingidos todos os objetivos propostos nesta pesquisa, sendo identificadas as novas tendências do mercado de motores brasileiro e gerando subsídios para o desenvolvimento de novas políticas de eficiência energética no país. / [en] Electric motors in Brazil are responsible for the consumption of about 25 percent of all electricity in the country and, being mostly presented in the industry. These equipments are manufactured for being used in hydraulic pumps, air compressors, elevators, etc., and can be commercialized in compliance with the energy efficiency levels defined by INMETRO/MDIC Ordinance N488 of 2010, ensuring adequate energy consumption. However, some establishments are commercializing refurbished motors, not complying with the regulation considered by the Ordinance, including reforming motors without a minimum condition of use. The aim of this dissertation is to evaluate the Brazilian market of refurbished motors, including resale market and maintenance market, estimating the energy losses due to incorrect reconditioning. The methodology of the work can be divided in five steps: state of the art of refurbished motors; quantifying companies and employees by querying the database come from the government; survey on samples of companies that are doing the refurbishing service; extrapolation of the study conducted in the surveyed samples of companies to the population of companies; comparison of results with previous studies and estimating of energy losses in Brazil. As a result, the market for refurbished motors was characterized and dimensioned, containing: 6 503 companies; 24.400 employees; 45 percent of companies performing resale of refurbished motors; 6.9 million motors being refurbished per year, totaling 7.46 percent of energy losses, equivalent to 2.9 TW h. In addition, of the 20 million motors remaining in Brazil in 2016, there is a loss of 8.4 TW h per use of refurbished motors, and a large increase of the sale of low quality imported motors. Thus, all the proposed objectives in this dissertation were achieved, having been identified the new trends in the Brazilian electric motor market and generating subsidies for energy efficiency policies in the country.

This work is focused on innovative construction of the industrial radial sealless pump and mainly on construction of the three phase DC/AC converter based on new semiconductor technology SiC. These new semiconductor devices allow move switching frequency up to 100 kHz. For such high switching frequency new non-conventional topology of the output filter was designed. This high frequency is currently unusual in three-phase application with output voltage 400V. High switching frequency reduces size of wound components of the output filter and its presence is accepted in terms of total weight and price of the whole system. Clear sinus waveform of the output converter voltage reduces torque ripple, EMC and extend the lifetime and reliability of mechanical parts and the whole pump drive. Three phase synchronous motor is directly placed into the pump body and is designed as slotless motor. In the inlet area is the classical bearing replaced by active magnetic bearing. It is used due to possibility to pump aggressive liquids or substances where high level of cleanness has to be guaranteed.